Secara umum keterjadian timah dan mineral asosiasinya sangat berkait dengan batuan granit bersifat alkali dan mempunyai tipe S yang terbentuk dalam lingkungan perisai benua (Continental/Cratonic Shield) hingga paparan benua (Continental Margin) berumur Prekambrium hingga Tersier. Kajian dari beberapa aspek geologi dan kondisi batuan granitik di Indonesia memberikan gambaran kemungkinan terda…
Lokasi singkapan WR-2 terletak di hulu anak sungai yang diperkirakan bermuara ke Sungai Klabau. Lokasi tersebut dapat dicapai melalui jalan pemboran minyak yang dibuat oleh Pertamina, Asamera dan jalan desa dari Desa Bejubang menuju Dusun Pulau Alang (?) ke a rah selatan sejauh 6 km, dilanjutkan melalui jalan setapak sejauh kurang lebih 1,5 km. Kendaraan …
The change of seasons is most clearly distinguishable in the appearances of mountains. Councurrently with snow-melting, the yellowish green colored sprouts of plants attract our attention and tell us the advent of spring on mountains. And when the leaves change their colour from fresh green to dark green, we are informed that the rainy seasons is over and the summer is setting in.
Bahan galian industri adalah mineral industri dan batuan, yaitu semua bahan galian di luar mineral logam dan radioaktif yang mempunyai kegunaan langsung untuk berbagai industri. Menurut undang-undang dan peraturan yang berlaku ten tang penggolongan bahan galian (PP No. 27/1980), maka sebagian besar bahan galian industri termasuk bahan galian Golongan C. Secara geologi bahan g…
Geodynamics, the study of global movements and of the forces driving them, is a rekatively fresh offshoot from the vigorously branching tree of the earth sciences. Before the advent of Alfred Wegener on this scene in the early nineteen-hundreds, the idea of permanency in the distribution of continents and oceans was almost sacrosanct.
Das Antlitz der Erde, or “The Face of the Earth”, was the title of the first great magnum opus on the gross surface features of the earth by Eduard Suess late last century. A recent British television documentary with the same purpose bore the same title.
rectangular area of 72,000 ha along the tidal reach of the Batanghari River, northeast of Jambi, Sumatra, has been proposed by the Indonesian government as one of the sites for developing a community to relieve the population pressure in other parts of Indonesia (see figure l). By year 2000, Hanson and Koesoebiono (1975) estimated that a population of perhaps 250 million people would requir…
The impetus for publishing this set of articles was the realization that, year after year. I and my students at Stanford were making copies (with varying degrees of legibility and legality) of the same classic articles on plate tectonics and geomagnetic reversals. At first we did this because there was so little material on the subject available.
lmu Petrografi batubara sebetulnya telah dipelajaari sejak awal abad ke 20 yang dipelopori oleh Marie Stopes, (1919) dan Reinhardt Thiessen, (1920). Kedua nama ini telah memperkenalkan terminologi dan klasifikasi batubara yang sampai saat ini masih terpakai. Namun penclitian batubara secara petrografi baru dimulai sejak tahun 1930-an, dimana Marie Stopes, (1930) memp…
The tectonic concept known as seafloor spreading , global tectonics and also as plate tectonics began engulfing the geological community in the early sixties. Within less than a decade this unifying, geotectonic hypothesis beame widely known, and judging from the current literature, it has also been widely accepted.